Demonstrating a perhaps more aggressive path than anticipated, Sun Microsystems is set to announce the open-sourcing of the core Java platform within 30 to 60 days, Sun President and CEO Jonathan Schwartz said at the Oracle OpenWorld conference on Wednesday morning.

It is java.util.concurrent. But you are right, this is an outstanding library for multithreading written by Doug Lea. It has no equivalent in any language AFAIK. I recently an ETL using a pipeline design with this library and it was an order of magnitude faster than a very optimized C++ version.